Hub for a brake booster



FIG. 1 is a perspective view of a hub for a brake booster showing our new design;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a side elevation view of FIG. 1;

FIG. 4 is a front elevation view of FIG. 1; and,

FIG. 5 is a rear elevation view of FIG. 1. 

The ornamental design for a hub for a brake booster, as shown and described. 